Book/Report

FZJ-2016-05624

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Bestimmung effektiver Wirkungsquerschnitte und Abbrand-Berechnung zu HTR-Brennstoffbestrahlungen in einer Reflektorposition des Forschungsreaktors FRJ-2 (DIDO)

Weise, L.FZJ* ; Borchardt, G.FZJ* ; Meixner, C.FZJ*

1988
Kernforschungsanlage Jülich GmbH, Zentralbiliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/12632

Report No.: Juel-2240

Abstract: Since several years irradiations of HTR-spherical fuel elements have been done in a reflector position 6V at the JUlich research reactor FRJ-2 (DIDO), in the course of which the target burn up of the nuclear fuel has a fixed value. For the prediction of the shut down moment it is necessary to know the momentary fuel burn up state of the irradiation experiment at any time. On account of the construction of the irradiation rig the fuel burn up determination can only be performed by calculation. Only after that, this means following the irradiation end, the reached fuel burn up of the HTR-spherical fuel element can likewise be measured by gamma spectrometryor by mass spectrometry. The present report describes the neutronic calculations which are needed for the fuel burn up determination. Under the given circumstances especially the self shielding correction for the HTR-spherical fuel element is accentuated which in the case of low enriched fuel is inevitable because of the now important resonance absorption of the neutrons in the nuclear fuel U238. It appears, that under optimal circumstances our fuel burn up calculation is feasible with an average relative single standard deviation of approximately 7 percent. In the case of the HTR irradiation experiment JK13 there was found an agreement between the total fuel burn up which was calculated by our treatment on one hand, and those which was measured in the hot cells of the KFA on the other. This statement refers to a statistical significance level of 95 percent.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000 ; Retrocat)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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